Voting via ID would also make counting votes extremely more difficult, I guess (I suspect it is done by hand).
I happen to think the opposite, mainly because the count should not be done by hand.
A number is always the same, so no matter who writes it, the result will always be the same.
Of course, the person can also make a mistake typing the number, but maybe more quickly users write someone's name from memory than their ID. Dai would have to copy-paste the ID for less failures.
But of course, it depends on how the information is collected.